CN212627287U - Light storage charging station structure considering gradient utilization of power battery - Google Patents
Light storage charging station structure considering gradient utilization of power battery Download PDFInfo
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- CN212627287U CN212627287U CN202020964666.XU CN202020964666U CN212627287U CN 212627287 U CN212627287 U CN 212627287U CN 202020964666 U CN202020964666 U CN 202020964666U CN 212627287 U CN212627287 U CN 212627287U
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The utility model relates to a consider light storage charging station structure that power battery echelon utilized, include the photovoltaic power generation system that is connected with the direct current bus respectively, energy storage system and charging system, photovoltaic power generation system, energy storage system and charging system are connected with energy management system respectively, energy storage system includes conventional energy storage module and echelon energy storage module that are connected with the direct current bus through two-way DC/DC converter, two-way DC/DC converter still is connected with energy management system, echelon energy storage module includes that a plurality of rated voltage are the same, the different retirement power battery of capacity retention ratio, a plurality of retirement power battery are connected to two-way DC/DC converter through the switch block. Compared with the prior art, the utility model discloses constitute the echelon energy storage module with a plurality of retired power battery that rated voltage is the same, the capacity retention ratio is different to combine energy management system, switch block, can reduce retired power battery echelon utilization cost, avoid taking place the problem of retired power battery accelerated attenuation simultaneously.
Description
Technical Field
The utility model belongs to the technical field of the power battery echelon application technique and specifically relates to a consider light storage charging station structure that power battery echelon utilized.
Background
Research shows that when the capacity of the power battery is reduced to 70% -80%, the power battery cannot be continuously applied to the electric automobile. According to the recent development situation of the electric automobile industry, the number of the retired power batteries will show a larger increase in the next period of time. Therefore, the echelon utilization technology of the power battery has important significance for the sustainable development of the electric automobile industry and the large-scale development of energy-saving and emission-reducing work.
The prior art mainly has two methods for large-scale echelon utilization of retired power batteries: one is to disassemble the retired power battery into single batteries, and then to recombine and carry out secondary utilization; the other is to directly connect the whole battery pack into an energy storage system through series-parallel connection.
Both of these methods of utilization have certain limitations: the former method has higher processing requirements on the battery pack, so that high processing cost is generated in the whole recycling process; in the latter method, due to different attenuation degrees of different battery packs, the capacity of the retired power battery can be accelerated to attenuate when the battery packs are operated in series and parallel in a large scale, and the service life of the battery packs is shortened.
SUMMERY OF THE UTILITY MODEL
The purpose of the utility model is to overcome the defects of the prior art and provide a light storage charging station structure considering the echelon utilization of the power battery, so as to reduce the processing cost generated in the echelon utilization process of the power battery and improve the economy of the echelon utilization of the power battery; meanwhile, the problem that the capacity of the battery is attenuated quickly due to the fact that a plurality of retired batteries are discharged in series and parallel connection at the same time is solved, and the service life of the retired power battery is prolonged.
The purpose of the utility model can be realized through the following technical scheme: the utility model provides a consider light storage charging station structure that power battery echelon was utilized, includes photovoltaic power generation system, energy storage system, the charging system that is connected with the direct current bus respectively, photovoltaic power generation system, energy storage system and charging system are connected with energy management system respectively, energy storage system includes conventional energy storage module and echelon energy storage module, conventional energy storage module and echelon energy storage module all are connected with the direct current bus through two-way DC/DC converter, two-way DC/DC converter still is connected with energy management system, echelon energy storage module includes that a plurality of rated voltage are the same, the different retired power battery of capacity retention ratio, and a plurality of retired power battery are connected to two-way DC/DC converter through the switch block.
In the period of high photovoltaic power generation capacity, putting the retired power battery with high capacity retention rate into the photovoltaic power generation capacity to perform supplementary energy storage; and in the period of less photovoltaic power generation, putting the retired power battery with lower capacity retention rate into the energy storage device for supplementing energy storage. By the mode, retired power batteries with different capacity retention rates are utilized periodically, the disassembly and recombination cost generated in the gradient utilization process of the power batteries is eliminated, and the economy of the gradient utilization of the power batteries is improved; meanwhile, only one retired power battery is connected to the direct-current bus at each time through control over the switch group so as to carry out charging and discharging, the problem that the capacity of the battery is attenuated in an accelerated mode due to the fact that a plurality of retired batteries are connected in series and in parallel and discharged at the same time is solved, and the service life of the retired power battery can be prolonged.
Furthermore, the switch group comprises a capacity selection switch group and a plurality of battery state switch groups, wherein the capacity selection switch group is provided with a plurality of capacity selection sub-switches respectively connected with the bidirectional DC/DC converter, the plurality of battery state switch groups are respectively and correspondingly connected to the plurality of retired power batteries, and a plurality of battery state sub-switches with the same number as the capacity selection sub-switches are arranged in a single battery state switch group.
When the optical storage charging station operates, the capacity selector sub-switch which is closed is determined according to the photovoltaic power generation amount condition in the period, so that retired power batteries with different capacities are selected to be put into the direct current bus to operate; and meanwhile, predicting the capacity retention rate of each retired power battery according to the information of the number of charge and discharge times, the operating environment, the operating age and the like of the retired power batteries, and closing a corresponding battery state sub-switch representing the current capacity on each retired power battery according to the capacity retention rate of each retired power battery. Through the mode, the variable-capacity operation of the energy storage system of the optical storage charging station is realized, so that each retired power battery is utilized in a staged manner, and the operation flexibility of the optical storage charging station is improved.
Furthermore, the switch group is specifically a programmable control switch group to realize the automatic operation of the switch group and reduce the manual operation and maintenance cost.
Furthermore, the energy management system comprises a main controller, and an energy storage charging and discharging control module and a retired battery management module which are respectively connected with the main controller, wherein the energy storage charging and discharging module is respectively in communication connection with the bidirectional DC/DC converter and the capacity selection switch group, and the retired battery management module is respectively in communication connection with the plurality of battery state switch groups.
Further, the conventional energy storage module comprises a conventional energy storage battery, the rated voltage of the conventional energy storage battery is the same as that of the retired power battery, and the conventional energy storage battery is connected to the bidirectional DC/DC converter through a controllable switch.
Furthermore, the number of the echelon energy storage modules is N, N is larger than or equal to 1, rated voltages of retired power batteries in different echelon energy storage modules are different, and each echelon energy storage module is connected with the direct current bus through a bidirectional DC/DC converter with different voltage grades, so that the retired power batteries with different voltage grades can be connected to the direct current bus, and the application range of recycling of the retired power batteries is expanded.
Further, the photovoltaic power generation system comprises a photovoltaic array and a DC/DC converter which are connected in sequence, the DC/DC converter is connected to the direct current bus, and the photovoltaic array and the DC/DC converter are respectively connected with the energy management system.
Furthermore, the energy management system comprises an MPPT (Maximum Power Point Tracking) control module connected with a master controller, the master controller is respectively connected with the photovoltaic array and the DC/DC converter, and the MPPT control module is connected to the DC/DC converter.
Further, charging system is including the electric pile and the equipment of treating charging that connect gradually, energy management system includes the control module that charges who is connected with main control unit, the control module that charges is connected to and fills electric pile, it is connected to main control unit to fill electric pile.
Furthermore, the direct current bus is connected with a public power grid end through an inverter, the energy management system comprises a grid-connected control module connected with a main controller, the grid-connected control module is connected to the inverter, and the inverter and the public power grid end are respectively connected to the main controller.
Compared with the prior art, the utility model has the advantages of it is following:
one, the utility model discloses constitute echelon energy storage module with a plurality of retired power battery that rated voltage is the same, the capacity retention ratio is different, can divide period, divide the echelon to insert direct current bus according to the energy storage needs to reduce disassembling and recombination cost that the power battery echelon utilized the in-process to produce, improve the economic nature that the power battery echelon utilized.
Two, the utility model discloses a set up capacity selector switch group and a plurality of battery state switch group that correspond with the power battery of retirement and be connected to this realizes "automatic input" and "automatic degradation" of each power battery of retirement for direct current bus only inserts the single power battery of retirement that matches with required capacity, required voltage class, avoids appearing a plurality of batteries of retirement series-parallel connection and discharges simultaneously and lead to the problem of battery capacity attenuation with higher speed, extension power battery life of retirement.
Three, the utility model discloses a controllable programming switch group design combines energy management system and the same conventional energy storage battery design with retired power battery rated voltage grade to this improves the quantity of light storage charging station operation flexibility, reduction two-way DC converter, further saves light storage charging station construction cost, improves economic benefits.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of a stepped energy storage module;
FIG. 3 is a schematic structural diagram of an optical storage and charging station according to an embodiment;
wherein: 1. the system comprises a photovoltaic power generation system, 2, an energy storage system, 21, a conventional energy storage module, 22, a echelon energy storage module, 221, a retired power battery, 222, a capacity selection switch group, 223, a battery state switch group, 3, a charging system, 4, an energy management system and 5 and a bidirectional DC/DC converter.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Example (b):
as shown in fig. 1, an optical storage charging station structure considering echelon utilization of a power battery includes a photovoltaic power generation system 1, an energy storage system 2 and a charging system 3 respectively connected with a DC bus, the photovoltaic power generation system 1, the energy storage system 2 and the charging system 3 are respectively connected with an energy management system 4, the energy management system 4 controls energy flow between the DC bus and the photovoltaic power generation system 1, the energy storage system 2 and the charging system 3, the energy storage system 2 includes a conventional energy storage module 21 and an echelon energy storage module 22, both the conventional energy storage module 21 and the echelon energy storage module 22 are connected with the DC bus through a bidirectional DC/DC converter 5, and the bidirectional DC/DC converter 5 is connected with the energy management system 4.
Wherein, the echelon energy storage module 22 includes a plurality of retired power batteries 221 with the same rated voltage and different capacity retention rates, a capacity selection switch group 222 and a plurality of battery state switch groups 223, one capacity selection switch group 222 and a plurality of battery state switch groups 223 jointly form a switch group, the capacity selection switch group 222 is provided with a plurality of capacity selection sub-switches respectively connected with the bidirectional DC/DC converter 5, the plurality of battery state switch groups 223 are respectively connected to the plurality of retired power batteries 221 correspondingly, a single battery state switch group 223 is provided with a plurality of battery state sub-switches with the same number as the number of the capacity selection sub-switches, each battery state sub-switch is connected with the capacity selection sub-switch correspondingly to realize that the retired power batteries 221 with different capacities are connected to the DC bus, in this embodiment, the capacity selection switch group 222 and the plurality of battery state switch groups 223 are both programmable control switch groups, the automatic operation of the switch group is realized, and the manual operation and maintenance cost is reduced.
Specifically, as shown in fig. 2, in the echelon energy storage module 22, a battery state switch group S is connected to any retired power battery ii(i-1, 2, …, q), any battery state switch set SiAll contain p battery state sub-switches Si1～SipAnd (p is 1,2 and …), and p steps of the capacity retention rate of the retired power battery are respectively in one-to-one correspondence. When the power battery is in operation, the corresponding battery state sub-switch can be closed according to the gradient of the capacity retention rate of the retired power battery.
The output side of the bidirectional DC/DC converter connected with the echelon energy storage module 22 is connected with a capacity selection switch group W, and the capacity selection switch group W comprises p capacity selection sub-switches W1～WpAnd p steps of capacity retention rate of the retired power battery are also in one-to-one correspondence. Any battery state sub-switch SijOne end far away from the retired power battery is connected with a capacity selector sub-switch WjThe end remote from the bidirectional DC/DC converter is connected. When the device is operated, the corresponding capacity selection sub-switch can be switched on according to the capacity echelon required to be switched in.
The overall structure of the optical storage charging station in this embodiment is shown in fig. 3, and the photovoltaic power generation system 1 is formed by connecting a photovoltaic array and a DC/DC converter;
the energy storage system 2 comprises a conventional energy storage module and m echelon energy storage modules (m is 1,2, …), wherein the conventional energy storage module is a conventional energy storage battery with the rated voltage same as the rated voltage of q retired power batteries in the echelon energy storage module 1, and assuming that each bidirectional DC/DC converter takes one side connected to a direct current bus as an input side, the conventional energy storage battery is connected to the output side of the same bidirectional DC/DC converter through a switch and the echelon energy storage module 1, the internal structures of the echelon energy storage modules 2-m can refer to the echelon energy storage module 1, and the difference is that the number q of the retired power batteries is different, the rated voltage grades of the output sides of the bidirectional DC/DC converters are different, and the output sides of the bidirectional DC/DC converters are not connected with the conventional energy storage battery;
the charging system 3 is specifically n charging piles (n is 1,2, …) connected to the dc bus, in this embodiment, the device to be charged is an electric vehicle, and the electric vehicle can be connected to the charging piles for charging, so as to be used as a main consumption object of electric energy in the optical storage charging station; in addition, the direct current bus is also connected to a public power grid through an inverter and exchanges energy with the public power grid;
the energy management system 4 comprises a main controller and an energy storage and charge and discharge control module, a retired battery management module, an MPPT control module, a charge control module and a grid-connected control module which are respectively connected with the main controller, wherein the main controller sends a control instruction to a capacity selection switch group 222, each battery state switch group 223 and each converter (including a bidirectional DC/DC converter, a DC/DC converter in a photovoltaic power generation system, a charging pile in the charging system and an inverter connected with a direct current bus) by reading real-time running state information of each part in the optical storage charging station, and controls energy flow of the whole optical storage charging station:
the MPPT control module is in signal connection with a DC/DC converter in the photovoltaic power generation system and controls the photovoltaic array to output the maximum power;
the energy storage charging and discharging control module is in signal connection with the bidirectional DC/DC converter connected with each echelon energy storage module and controls the charging and discharging of the conventional energy storage battery and each retired power battery as well as the on-off states of the switch and each capacity selector sub-switch connected with the conventional energy storage battery;
the charging control module is in signal connection with the charging piles 1-n to schedule the charging of the electric automobile;
the grid-connected control module is in signal connection with the inverter and controls energy exchange between the optical storage charging station and a public power grid;
the retired battery management module is in signal connection with each battery state switch group, the main controller estimates the real-time capacity retention rate of each retired power battery according to parameters such as the charge-discharge cycle number, the operating environment and the operating age of each retired power battery, controls the on-off state of each battery state sub-switch, achieves self-degradation of each retired power battery, and enables only one retired power battery with the same capacity echelon to be connected with the corresponding battery state sub-switch by changing a control strategy in order to avoid battery life shortening caused by simultaneous discharge of power batteries with the same capacity echelon.
Before the construction of the optical storage charging station, the optical storage charging station construction unit can reach an agreement with an electric vehicle enterprise. According to the power battery recycling requirements of electric automobile enterprises and electric automobile brands or series, determining one or more power battery rated voltage standards needing large-scale recycling, and performing configuration of conventional energy storage batteries and model selection of a bidirectional DC/DC converter in the echelon energy storage module 1 according to the power battery rated voltage standard with the maximum recycling amount; and according to other rated voltage standards, selecting bidirectional DC/DC converters with corresponding voltage levels respectively, and expanding the echelon energy storage modules 2-m with corresponding number. In each echelon energy storage module, power batteries which are retired on electric vehicles of different brands or series and can be matched with the same bidirectional DC/DC converter are respectively configured in batches. It should be noted that the expansion of the echelon energy storage module is accompanied by the increase of the converter cost, and the increase of the converter cost and the corresponding recycling value should be balanced in the engineering to carry out reasonable construction and planning.
When the optical storage charging station operates, under the control of the energy management system, if the electric energy generated by the photovoltaic power generation system is greater than the load of the electric vehicle charging system, the photovoltaic power generation system can provide the electric energy for the electric vehicle charging system and can also charge the energy storage system, and if the electric energy still has surplus electric quantity after being charged for the energy storage system, the electric energy can be transmitted to a public power grid; if the electric energy generated by the photovoltaic power generation system can not provide enough electric energy for the load of the electric automobile charging system, the energy storage system discharges to supplement the electric energy shortage of the electric automobile charging system, and if the electric energy storage system still can not meet the electric energy requirement of the electric automobile charging system after discharging, the public power grid can further provide electric energy support.
When the light storage charging station operates at different periods, the corresponding capacity selection switch is switched on according to the photovoltaic power generation amount of the current period, so that the retired power battery with the corresponding capacity is connected to the direct-current bus to supplement energy storage. In the period of large photovoltaic power generation, a retired power battery with large capacity retention rate is accessed; and in the period of low photovoltaic power generation, a retired power battery with low capacity retention rate is accessed. By the mode, the ex-service power batteries are used in batches in a gradient manner, so that the high cost of disassembly and recombination in the process of using the ex-service batteries is eliminated, and the problem that the service life of the batteries is shortened due to the fact that the batteries are connected in series and in parallel and are discharged simultaneously is avoided; through the two points, the use cost of the retired power battery is reduced, and the development of energy conservation and emission reduction work is promoted. On the other hand, for the optical storage charging station, the configuration capacity of the conventional energy storage battery can be reduced, and the construction cost of the optical storage charging station is saved, so that the ecological benefit is improved, and the economic benefit is improved.
Claims (10)
1. A light storage charging station structure considering echelon utilization of power batteries is characterized by comprising a photovoltaic power generation system (1), an energy storage system (2) and a charging system (3) which are respectively connected with a direct-current bus, wherein the photovoltaic power generation system (1), the energy storage system (2) and the charging system (3) are respectively connected with an energy management system (4), the energy storage system (2) comprises a conventional energy storage module (21) and an echelon energy storage module (22), the conventional energy storage module (21) and the echelon energy storage module (22) are respectively connected with the direct-current bus through a bidirectional DC/DC converter (5), the bidirectional DC/DC converter (5) is further connected with the energy management system (4), and the echelon energy storage module (22) comprises a plurality of retired power batteries (221) with the same rated voltage and different capacity retention rates, a plurality of retired power batteries (221) are connected to the bidirectional DC/DC converter (5) through a switch group.
2. An optical storage and charging station structure considering the echelon utilization of power batteries as claimed in claim 1, wherein the switch group comprises a capacity selection switch group (222) and a plurality of battery state switch groups (223), the capacity selection switch group (222) is provided with a plurality of capacity selection sub-switches respectively connected with the bidirectional DC/DC converter (5), the plurality of battery state switch groups (223) are respectively connected to a plurality of retired power batteries (221), and a plurality of battery state sub-switches with the same number as that of the capacity selection sub-switches are arranged in a single battery state switch group (223).
3. A light storage and charging station arrangement allowing for echelon utilization of power cells as claimed in claim 2, wherein the capacity selection switch bank (222) and the battery status switch bank (223) are programmable switch banks.
4. The structure of claim 3, wherein the energy management system (4) comprises a main controller, and an energy storage charging and discharging control module and a retired battery management module which are respectively connected with the main controller, wherein the energy storage charging and discharging control module is respectively connected with the bidirectional DC/DC converter (5) and the capacity selection switch group (222) in a communication manner, and the retired battery management module is respectively connected with the plurality of battery state switch groups (223) in a communication manner.
5. An optical storage and charging station arrangement allowing for echelon utilization of power cells according to claim 1, characterized in that the conventional energy storage module (21) comprises conventional energy storage cells having the same voltage rating as the voltage rating of the retired power cell (221), which are connected to the bidirectional DC/DC converter (5) by means of controllable switches.
6. The structure of the optical storage and charging station considering the echelon utilization of the power battery as claimed in claim 1, wherein the number of the echelon energy storage modules (22) is N, N is greater than or equal to 1, rated voltages of retired power batteries (221) in different echelon energy storage modules (22) are different, and each echelon energy storage module (22) is connected with a direct current bus through a bidirectional DC/DC converter (5) with different voltage classes.
7. A light storage and charging station structure considering power battery echelon utilization according to claim 4, characterized in that the photovoltaic power generation system (1) comprises a photovoltaic array and a DC/DC converter connected in sequence, the DC/DC converter is connected to a direct current bus, and the photovoltaic array and the DC/DC converter are respectively connected with an energy management system (4).
8. A light storage and charging station structure considering power battery echelon utilization according to claim 7, characterized by that, the energy management system (4) includes MPPT control module connected with the main controller, the main controller is connected with the photovoltaic array, the DC/DC converter respectively, the MPPT control module is connected with the DC/DC converter.
9. The structure of claim 4, wherein the charging system (3) comprises a charging pile and a device to be charged which are connected in sequence, the energy management system (4) comprises a charging control module connected with the main controller, the charging control module is connected to the charging pile, and the charging pile is connected to the main controller.
10. A light storage and charging station structure considering the echelon utilization of power batteries according to claim 4, characterized in that the DC bus is also connected with the public power grid terminal through an inverter, the energy management system (4) comprises a grid-connected control module connected with a main controller, the grid-connected control module is connected to the inverter, and the inverter and the public power grid terminal are respectively connected to the main controller.
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| CN202020964666.XU CN212627287U (en) | 2020-05-30 | 2020-05-30 | Light storage charging station structure considering gradient utilization of power battery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116316769A (en) * | 2023-05-23 | 2023-06-23 | 广东天枢新能源科技有限公司 | Storage and charging method and system based on echelon utilization of retired battery packs |
| CN117477623A (en) * | 2023-11-03 | 2024-01-30 | 江苏淮海新能源股份有限公司 | Energy management system and control method of photovoltaic energy storage charging station |
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2020
- 2020-05-30 CN CN202020964666.XU patent/CN212627287U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116316769A (en) * | 2023-05-23 | 2023-06-23 | 广东天枢新能源科技有限公司 | Storage and charging method and system based on echelon utilization of retired battery packs |
| CN116316769B (en) * | 2023-05-23 | 2023-09-26 | 广东天枢新能源科技有限公司 | Storage and charging method and system based on echelon utilization of retired battery packs |
| CN117477623A (en) * | 2023-11-03 | 2024-01-30 | 江苏淮海新能源股份有限公司 | Energy management system and control method of photovoltaic energy storage charging station |
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